Logstash not aggregating as it should (I think)

Hey, there.

I am trying to use LogStash to send data do ES and I have encountered a problem I could not handle yet:

Consider a table like where the important columns are:

proc_id | title | operations_id | products_id | keywords_name | keywords_id

Sample data:

This table, is generated by a query and converted to JSON documents with LogStash + JDBC. The problem is:

When I run logstash, it does not aggregate all the "operations_id" and "products_id". It looks like it is skipping some rows. So, considering the table above (in google docs), sometimes the document is stored in ES like this:

{
    "id": 510,
    "products_id": [10, 20, 30, 40], 
    etc..
}

If I drop the index and run it again, it looks like:

 {
     "id": 510,
     "products_id": [50],
     etc..
 }

But the correct would be:

{
    "id": 510,
    "products_id": [10, 20, 30, 40, 50],
    etc..
}

My logstash.conf file looks like this:

filter {
    aggregate {
    task_id => "%{proc_id}" # this is the ID of the procedure, the main unique ID.
    code => "
    map['id'] = event.get('proc_id')
    map['title'] = event.get('title')
    map['description_raw'] = event.get('description_raw')
    map['scripts'] ||= []
    map['scripts'] << {
            'title_raw' => event.get('scripts_title_raw'),
            'content_raw' => event.get('scripts_content_raw')
    }
    map['categories'] ||= []
    map['categories'] << event.get('categories_name')
    map['keywords'] ||= []
    map['keywords'] << event.get('keywords_name')
    map['operations'] ||= []
    map['operations'] << event.get('operations_id')
    map['products'] ||= []
    map['products'] << event.get('products_id')
    "
    push_previous_map_as_event => true
    timeout => 5000
    timeout_tags => ['aggregated']
    }

    if "aggregated" not in [tags] {
            drop {}
    }

    # Remove fields that are not needed in ElasticSearch:
    else {
            mutate {
                    remove_field => ["proc_id", "categories_name", "categories_id", "keywords_id", "keywords_name", "scripts_id", "operations_id", "products_id"]
    }
    }
    }

Any help is very appreciated. I do not know how to effectively aggregate all the "products_id" and "operations_id", "keyword_names" in one single document into ES.

Thank you.

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